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A self defense weapon formed as a memo pad and which is easily held by a person's fingers, therefore making it possible to provide protection from a mugger and also to quickly and easily write a record or a message without failure of missing or forgetting significant information under a stressful situation.
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| Number | Title | Issue Date |
| 7982546 | Quadrature local oscillator generation for direct conversion radio transceiver A method of generating a quadrature local oscillator (LO) frequencies is provided. In this method, a voltage-controlled oscillator (VCO) frequency can be mixed with a divided version of the VCO frequency to generate mixed signals. A lower sideband of the mixed signa... | 07/19/2011 |
| 7772932 | Quadrature local oscillator generation for direct conversion radio transceiver A method of generating a quadrature local oscillator (LO) frequencies is provided. In this method, a voltage-controlled oscillator (VCO) frequency can be mixed with a divided version of the VCO frequency to generate mixed signals. A lower sideband of the mixed signa... | 08/10/2010 |
| 7683724 | Frequency synthesizer A voltage-controlled ring oscillator comprises a ring oscillator having a plurality of differential delay stages for generating signals having a common programmable oscillation frequency with different phases, and a pair of single-sideband mixers coupled to the diff... | 03/23/2010 |
| 7337294 | Method and apparatus for adjusting the performance of a synchronous memory system A method and apparatus for adjusting the performance of a memory system is provided. A memory system comprises a master device and a slave device. A memory channel couples the master device to the slave device such that the slave device receives the system operating... | 02/26/2008 |
| 7327198 | Method and system for a polyphase clock for a second intermediate frequency (IF) mixer to improve signal quality Methods and systems for reducing interference in a signal are disclosed herein. Aspects of the method may comprise generating a first local oscillator signal. The generated first local oscillator signal may be phase-shifted to generate a second local oscillator sign... | 02/05/2008 |
| 7321268 | Ultra wideband and fast hopping frequency synthesizer for MB-OFDM wireless application A frequency synthesizer with a single PLL and multiple SSB mixers is presented. The frequency synthesizer includes a single PLL outputting a reference signal that is fed to a plurality of dividers coupled in sequence. The outputs from the dividers are mixed by the S... | 01/22/2008 |
| 7315219 | Multiphase voltage controlled oscillator A multiphase voltage controlled oscillator includes at least one ring oscillating unit and a resistor ring; the ring oscillating unit is formed by connecting a plurality of phase-delay elements in cascade and the resistor ring is formed by connecting a plurality of ... | 01/01/2008 |
| 7310023 | Frequency synthesizer A frequency synthesizer in an ultra wide band (UWB) wireless communication system which transmits and receives data through multiband includes a frequency generation means which generates a plurality of frequency signals; and a frequency adjustment means which recei... | 12/18/2007 |
| 7304480 | Radio mode selectivity block for a detector for detecting a buried current carrying conductor A radio mode selectivity block 41 for a detector 1 for detecting a buried current carrying conductor comprises a plurality of beat frequency oscillators 53 to center the bandwidth of detection of the detector 1 on target very low frequenc... | 12/04/2007 |
| 7302011 | Quadrature frequency doubling system The frequency doubler of the present invention operates to provide an in-phase signal and a quadrature signal, each having a frequency equal to twice the frequency of a reference signal. The in-phase and quadrature signals are based on signals that are 0 degrees, 45... | 11/27/2007 |
| 7302248 | Harmonic image-reject converter A signal generator for generating signals that are spaced π/X rad apart, where X is an integer. The signal generator includes at least one delay cell with a delay that approximately corresponds to a phase shift π/X rad for a given signal. The signal generator also... | 11/27/2007 |
| 7250822 | Clock oscillator An oscillator circuit and a method of generating an oscillating signal are disclosed. An oscillator comprises a first flip-flop and a second flip-flop coupled with the first flip-flop to provide an oscillating signal. A method of generating an oscillating signal com... | 07/31/2007 |
| 7136622 | Adaptive radio transceiver with noise suppression An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged ... | 11/14/2006 |
| 7064617 | Method and apparatus for temperature compensation Temperature compensation is achieved by adjusting a divide ratio of a multi-modulus divider circuit in a feedback path of a phase-locked loop based on the detected temperature. The divide ratio is adjusted based on stored adjustment values stored in non-volatile mem... | 06/20/2006 |
| 7039147 | Delay locked loop circuitry for clock delay adjustment Delay locked loop circuitry for generating a predetermined phase relationship between a pair of clocks. A first delay-locked loop includes a delay elements arranged in a chain, the chain receiving an input clock and generating, from each delay element, a set of phas... | 05/02/2006 |
| 7035351 | Automatic gain control loop apparatus A DC offset cancelling circuit with multiple feedback loops suppresses DC offset voltages within an automatic gain control loop apparatus. The apparatus includes a plurality of gain stages connected in series that receive and amplify an input RF signal. Each gain st... | 04/25/2006 |
| 7031668 | Adaptive radio transceiver with a local oscillator An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged ... | 04/18/2006 |
| 7016450 | Clock recovery circuit and related methods A clock recovery circuit for generating an output signal that is synchronized with an input signal. The clock recovery circuit includes a charge pump, a first filter, an oscillator, a switch circuit, and a second filter. When the charge pump operates, the switch cir... | 03/21/2006 |
| 6980787 | Image rejection mixing in wideband applications A ring oscillator produces an in-phase and quadrature phase radio frequency signal. A first mixer mixes the in-phase signal with a received signal. A second mixer mixes the quadrature phase signal with the received signal. A combiner, operatively coupled to the firs... | 12/27/2005 |
| 6975174 | Clock oscillator An oscillator circuit and a method of generating an oscillating signal are disclosed. An oscillator comprises a first flip-flop and a second flip-flop coupled with the first flip-flop to provide an oscillating signal. A method of generating an oscillating signal com... | 12/13/2005 |
| 6975838 | Adaptive radio transceiver with noise suppression An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged ... | 12/13/2005 |
| 6970027 | Apparatus for generating clock signal in optical disk and method thereof A clock generator for reproducing data recorded onto an optical disk, and more particularly, an apparatus for stably generating a clock signal synchronized with an input signal and a method of generating a clock signal. The apparatus generating a clock signal includ... | 11/29/2005 |
| 6961546 | Adaptive radio transceiver with offset PLL with subsampling mixers An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged ... | 11/01/2005 |
| 5878335 | Composite direct digital synthesizer A low-power digital frequency synthesizer combining direct digital frequency synthesis techniques with serrodyne frequency translation principles to produce a wideband frequency response with high spectral purity. A conventional direct digital synthesizer... | 03/02/1999 |
| 5625324 | Ultra low noise frequency generator producing the sum of plural signal sources The frequencies of N oscillators are summed to provide a signal generator output signal. Because the phase noise power spectral densities of the oscillators add as power, the frequency summed output exhibits a noise degradation over a single oscillator of... | 04/29/1997 |
| 5559475 | Frequency synthesizer for synthesizing signals of a variety of frequencies by cross modulation A frequency synthesizer in which a PLL synthesizer 50 generates signals of frequency steps of an integer times a target frequency step. A base band generator 2 digitally generates sine wave signal components of the target frequency step. The outputs from ... | 09/24/1996 |
| 5497128 | Local oscillator system and frequency switching method for minimizing spurious components A local oscillator system carries out a frequency switching method, in which local signals with fewer spurious components can be obtained. The local oscillator system is provided with frequency generators for generating signals with different frequencies ... | 03/05/1996 |
| 5432853 | Digital signal processing system A selector circuit (11) generates generator polynomial information (SD) by performing a predetermined logic operation in response to a random number signal (S1). A quasi-random code generator circuit (1) outputs a quasi-random code (RP) by using a generat... | 07/11/1995 |
| 5408201 | Frequency synthesizer using three subfrequency synthesizers for generating two different frequencies A frequency synthesizer includes three subfrequency synthesizers: a first synthesizer generating a first subfrequency varying in units of a frequency step, a second synthesizer generating a second subfrequency varying in units of a frequency step being N ... | 04/18/1995 |
| 5180994 | Differential-logic ring oscillator with quadrature outputs A topology for a high speed voltage controlled oscillator (VCO) with quadrature outputs is produced utilizing four inverting differential circuits. The fully differential four stage ring oscillator has outputs from alternate delay circuits combined in bal... | 01/19/1993 |
| 5179359 | Digitally controlled frequency generator including a crystal oscillator A digitally controlled oscillator (100) having a first oscillator circuit (108) for providing an oscillator signal Fo of a defined frequency and a digital divider (110) for dividing the oscillator signal Fo by a selectable number con... | 01/12/1993 |
| 5166645 | Differential mixer oscillator A differential mixer oscillator employing two transistors in a differential pair as the sustaining amplifier for a quartz crystal resonator at some first high frequency. The bias current of the differential pair is modulated at a second high frequency der... | 11/24/1992 |
| 4965534 | Channel frequency generator for use with a multi-frequency output generator An apparatus and method is disclosed which phase locks a frequency-agile modulated output signal to any selected channel of a comb generated output. The phase error of an input signal is tracked, the input signal is modulated up to a carrier output freque... | 10/23/1990 |
| 4926130 | Synchronous up-conversion direct digital synthesizer A method and apparatus for generating high frequency signals, comprising generating a fundamental frequency signal over a predefined tuning range using a direct digital synthesizer with a digital to analog converter operating at a predetermined sampling f... | 05/15/1990 |
| 4859968 | Frequency generator A frequency synthesizer system generates a clock signal having an adjustable, accurate and stable frequency. The synthesizer produces a first reference frequency FR and an adjustable first intermediate frequency F1 equal to the frequency FR divided by a s... | 08/22/1989 |
| 4684902 | Radio frequency signal generator A radio frequency (RF) signal generator is disclosed which generates a baseband signal at a fixed center frequency and having required modulation characteristics. The baseband signal is translated to a desired output frequency signal by mixing with a step... | 08/04/1987 |
| 4683444 | Generator circuit for generating two sinusoidal signals with a phase difference of 90 degrees A generator circuit according to the invention generates two 90° phase-shifted frequency-variable sinusoidal signals by mixing the output signal of a fixed-frequency oscillator and of a continuously variable oscillator with the aid of two multipliers ope... | 07/28/1987 |
| 4682122 | Frequency synthesizer stage adding high frequency steps to an initial frequency A frequency synthesizer for adding large frequency steps to an initial frequency. A first phase lock loop divides the input frequency Fo+Ɗ(Ɗ being the sum of smaller frequency steps) by a rational division factor and adds to the result a standard freque... | 07/21/1987 |
| 4659999 | Direct frequency synthesizer which is step-wise variable and has phase continuity and phase reproducibility when switching frequencies In a signal generator based on Direct Frequency Synthesis, a first reference frequency generator generates a signal of a reference frequency. A plurality of second reference frequency generators, respectively, generates K signals with different frequencie... | 04/21/1987 |
| 4636733 | Quaternary frequency synthesizer A decimal frequency synthesizer in which, for each decade, two identical sets of four arithmetic progression frequencies are generated by programmed frequency divisions effected in parallel from a standard frequency and applied to two mixers. The first mi... | 01/13/1987 |
